To be fair leveling is an outdated mode of play that exists merely as a small content delivery tool, player learning curve, narration device, and ultimately a small gating mechanic. It does next to nothing to service the actual gameplay motivations (beyond basic mechanics) and player progression so prolonging the experience is a hinderance.
Any fond memories divergent from that theory are simply nostalgia. I love leveling a good deal actually, I don't know why...there's something straight forward and rewarding about it, but even I know it's not good for players to have it extended for arbitrary reasons. Blizzard recently stated that they counted on leveling as actual content for many years, but realize that's not what works for players anymore. More content and shorter leveling is a more tangiblem, efficient, and rewarding design.
It's also why a game with no endgame is going to fail exceptionally and quickly. (not talking about this game or any game specifically)